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Unformatted text preview: CHEM 356, Lecture 5, Fall 2009 1 C. The Compton Effect . Prior to 1923 all Xrays scattered by electrons in matter were thought to have the same wavelength as the incident Xrays (Thomson scattering). Observations : Compton noted that monochromatic Xrays scattered by a light element had two components in the scattering direction, one with = , the other with = + , and that: i) varied with the scattering angle , and increased rapidly at large scat- tering angle; ii) was independent both of and of the material doing the scattering of the Xrays. Explanation : treat Xrays as a stream of photons, and assume that scattering of photons by electrons gives rise to need a relativistic description, due to high incident energies of the photons, require the principle of equivalence of mass and energy (Einstein, 1911). CHEM 356, Lecture 5, Fall 2009 2 Some preliminary items: The principle of equivalence of mass and energy can be written as...
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- Fall '09